Calculate essential pore-scale hydrodyanmic coefficients under unsaturated conditions (i) adsorptive water film thickness (ii) radius of capilary curvatures of liquid-vapore interfaces (iii) degree of pore-scale saturation/relative water filled cross-sectional area (iv) relative pore-scale effective diffusion
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Millington, R. J., & Quirk, J. P. (1961). Permeability of porous solids. Transactions of the Faraday Society, 57(0), 1200–1207. https://doi.org/10.1039/TF9615701200